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3 - Větvení, funkce

1. Zaokrouhlení reálného čísla

#include <stdio.h>
#include <math.h>
 
float zaokrouhleni (float c, int n)
{
    float x = pow(10, n);
    float p = 0.5;
 
    if (c < 0) p = -0.5;
 
    return ((int)(c*x + p))/x;
}
 
int main()
{
    float cislo;
    int pocet;
 
    scanf("%f%i", &cislo, &pocet);
 
    printf("%.*f", pocet, zaokrouhleni(cislo, pocet));
 
    return 0;
}

2. Výpočet obsahu (plochy) obecného trojúhelníku

#include <stdio.h>
#include <math.h>
 
float heron (int a, int b, int c)
{
    float s, S;
    s = (a + b + b)/2.0;
    S = sqrt(s*(s-a)*(s-b)*(s-c));
    return S;
}
 
int main()
{
    unsigned int a, b, c;
 
    if (scanf("%i%i%i", &a, &b, &c) != 3)
    {
        return 101;
    }
 
    if ((a+b) < c || (b+c) < a || (a+c) < b || a < 1 || b < 1 || c < 1)
    {
        return 102;
    }
 
    printf("S = %0.2f\n", heron(a, b, c));
 
    return 0;
}

courses/b0b99prpa/solutions/lab03.txt · Last modified: 2020/10/09 21:12 by viteks